[NET]: rfkill: add support for input key to control wireless radio
The RF kill patch that provides infrastructure for implementing switches controlling radio states on various network and other cards. [dtor@insightbb.com: address review comments] [akpm@linux-foundation.org: cleanups, build fixes] Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ivo van Doorn
committed by
David S. Miller
David S. Miller
parent
2396a22e09
commit
cf4328cd94
407
net/rfkill/rfkill.c
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407
net/rfkill/rfkill.c
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/*
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* Copyright (C) 2006 Ivo van Doorn
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* Copyright (C) 2007 Dmitry Torokhov
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the
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* Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/workqueue.h>
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#include <linux/capability.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/rfkill.h>
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MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
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MODULE_VERSION("1.0");
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MODULE_DESCRIPTION("RF switch support");
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MODULE_LICENSE("GPL");
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static LIST_HEAD(rfkill_list); /* list of registered rf switches */
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static DEFINE_MUTEX(rfkill_mutex);
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static enum rfkill_state rfkill_states[RFKILL_TYPE_MAX];
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static int rfkill_toggle_radio(struct rfkill *rfkill,
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enum rfkill_state state)
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{
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int retval;
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retval = mutex_lock_interruptible(&rfkill->mutex);
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if (retval)
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return retval;
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if (state != rfkill->state) {
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retval = rfkill->toggle_radio(rfkill->data, state);
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if (!retval)
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rfkill->state = state;
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}
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mutex_unlock(&rfkill->mutex);
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return retval;
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}
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/**
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* rfkill_switch_all - Toggle state of all switches of given type
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* @type: type of interfaces to be affeceted
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* @state: the new state
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*
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* This function toggles state of all switches of given type unless
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* a specific switch is claimed by userspace in which case it is
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* left alone.
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*/
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void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state)
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{
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struct rfkill *rfkill;
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mutex_lock(&rfkill_mutex);
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rfkill_states[type] = state;
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list_for_each_entry(rfkill, &rfkill_list, node) {
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if (!rfkill->user_claim)
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rfkill_toggle_radio(rfkill, state);
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}
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mutex_unlock(&rfkill_mutex);
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}
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EXPORT_SYMBOL(rfkill_switch_all);
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static ssize_t rfkill_name_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct rfkill *rfkill = to_rfkill(dev);
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return sprintf(buf, "%s\n", rfkill->name);
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}
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static ssize_t rfkill_type_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct rfkill *rfkill = to_rfkill(dev);
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const char *type;
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switch (rfkill->type) {
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case RFKILL_TYPE_WLAN:
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type = "wlan";
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break;
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case RFKILL_TYPE_BLUETOOTH:
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type = "bluetooth";
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break;
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case RFKILL_TYPE_IRDA:
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type = "irda";
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break;
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default:
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BUG();
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}
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return sprintf(buf, "%s\n", type);
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}
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static ssize_t rfkill_state_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct rfkill *rfkill = to_rfkill(dev);
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return sprintf(buf, "%d\n", rfkill->state);
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}
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static ssize_t rfkill_state_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct rfkill *rfkill = to_rfkill(dev);
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unsigned int state = simple_strtoul(buf, NULL, 0);
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int error;
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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error = rfkill_toggle_radio(rfkill,
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state ? RFKILL_STATE_ON : RFKILL_STATE_OFF);
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if (error)
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return error;
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return count;
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}
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static ssize_t rfkill_claim_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct rfkill *rfkill = to_rfkill(dev);
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return sprintf(buf, "%d", rfkill->user_claim);
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}
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static ssize_t rfkill_claim_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct rfkill *rfkill = to_rfkill(dev);
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bool claim = !!simple_strtoul(buf, NULL, 0);
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int error;
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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/*
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* Take the global lock to make sure the kernel is not in
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* the middle of rfkill_switch_all
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*/
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error = mutex_lock_interruptible(&rfkill_mutex);
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if (error)
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return error;
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if (rfkill->user_claim != claim) {
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if (!claim)
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rfkill_toggle_radio(rfkill,
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rfkill_states[rfkill->type]);
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rfkill->user_claim = claim;
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}
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mutex_unlock(&rfkill_mutex);
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return count;
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}
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static struct device_attribute rfkill_dev_attrs[] = {
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__ATTR(name, S_IRUGO, rfkill_name_show, NULL),
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__ATTR(type, S_IRUGO, rfkill_type_show, NULL),
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__ATTR(state, S_IRUGO, rfkill_state_show, rfkill_state_store),
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__ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store),
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__ATTR_NULL
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};
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static void rfkill_release(struct device *dev)
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{
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struct rfkill *rfkill = to_rfkill(dev);
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kfree(rfkill);
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module_put(THIS_MODULE);
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}
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#ifdef CONFIG_PM
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static int rfkill_suspend(struct device *dev, pm_message_t state)
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{
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struct rfkill *rfkill = to_rfkill(dev);
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if (dev->power.power_state.event != state.event) {
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if (state.event == PM_EVENT_SUSPEND) {
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mutex_lock(&rfkill->mutex);
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if (rfkill->state == RFKILL_STATE_ON)
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rfkill->toggle_radio(rfkill->data,
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RFKILL_STATE_OFF);
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mutex_unlock(&rfkill->mutex);
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}
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dev->power.power_state = state;
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}
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return 0;
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}
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static int rfkill_resume(struct device *dev)
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{
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struct rfkill *rfkill = to_rfkill(dev);
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if (dev->power.power_state.event != PM_EVENT_ON) {
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mutex_lock(&rfkill->mutex);
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if (rfkill->state == RFKILL_STATE_ON)
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rfkill->toggle_radio(rfkill->data, RFKILL_STATE_ON);
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mutex_unlock(&rfkill->mutex);
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}
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dev->power.power_state = PMSG_ON;
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return 0;
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}
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#else
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#define rfkill_suspend NULL
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#define rfkill_resume NULL
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#endif
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static struct class rfkill_class = {
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.name = "rfkill",
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.dev_release = rfkill_release,
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.dev_attrs = rfkill_dev_attrs,
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.suspend = rfkill_suspend,
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.resume = rfkill_resume,
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};
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static int rfkill_add_switch(struct rfkill *rfkill)
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{
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int retval;
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retval = mutex_lock_interruptible(&rfkill_mutex);
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if (retval)
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return retval;
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retval = rfkill_toggle_radio(rfkill, rfkill_states[rfkill->type]);
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if (retval)
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goto out;
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list_add_tail(&rfkill->node, &rfkill_list);
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out:
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mutex_unlock(&rfkill_mutex);
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return retval;
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}
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static void rfkill_remove_switch(struct rfkill *rfkill)
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{
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mutex_lock(&rfkill_mutex);
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list_del_init(&rfkill->node);
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rfkill_toggle_radio(rfkill, RFKILL_STATE_OFF);
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mutex_unlock(&rfkill_mutex);
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}
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/**
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* rfkill_allocate - allocate memory for rfkill structure.
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* @parent: device that has rf switch on it
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* @type: type of the switch (wlan, bluetooth, irda)
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*
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* This function should be called by the network driver when it needs
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* rfkill structure. Once the structure is allocated the driver shoud
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* finish its initialization by setting name, private data, enable_radio
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* and disable_radio methods and then register it with rfkill_register().
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* NOTE: If registration fails the structure shoudl be freed by calling
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* rfkill_free() otherwise rfkill_unregister() should be used.
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*/
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struct rfkill *rfkill_allocate(struct device *parent, enum rfkill_type type)
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{
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struct rfkill *rfkill;
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struct device *dev;
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rfkill = kzalloc(sizeof(struct rfkill), GFP_KERNEL);
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if (rfkill)
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return NULL;
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mutex_init(&rfkill->mutex);
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INIT_LIST_HEAD(&rfkill->node);
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rfkill->type = type;
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dev = &rfkill->dev;
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dev->class = &rfkill_class;
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dev->parent = parent;
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device_initialize(dev);
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__module_get(THIS_MODULE);
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return rfkill;
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}
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EXPORT_SYMBOL(rfkill_allocate);
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/**
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* rfkill_free - Mark rfkill structure for deletion
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* @rfkill: rfkill structure to be destroyed
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*
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* Decrements reference count of rfkill structure so it is destoryed.
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* Note that rfkill_free() should _not_ be called after rfkill_unregister().
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*/
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void rfkill_free(struct rfkill *rfkill)
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{
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if (rfkill)
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put_device(&rfkill->dev);
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}
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EXPORT_SYMBOL(rfkill_free);
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/**
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* rfkill_register - Register a rfkill structure.
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* @rfkill: rfkill structure to be registered
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*
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* This function should be called by the network driver when the rfkill
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* structure needs to be registered. Immediately from registration the
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* switch driver should be able to service calls to toggle_radio.
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*/
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int rfkill_register(struct rfkill *rfkill)
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{
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static atomic_t rfkill_no = ATOMIC_INIT(0);
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struct device *dev = &rfkill->dev;
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int error;
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if (!rfkill->toggle_radio)
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return -EINVAL;
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error = rfkill_add_switch(rfkill);
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if (error)
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return error;
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snprintf(dev->bus_id, sizeof(dev->bus_id),
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"rfkill%ld", (long)atomic_inc_return(&rfkill_no) - 1);
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error = device_add(dev);
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if (error) {
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rfkill_remove_switch(rfkill);
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return error;
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}
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return 0;
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}
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EXPORT_SYMBOL(rfkill_register);
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/**
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* rfkill_unregister - Uegister a rfkill structure.
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* @rfkill: rfkill structure to be unregistered
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*
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* This function should be called by the network driver during device
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* teardown to destroy rfkill structure. Note that rfkill_free() should
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* _not_ be called after rfkill_unregister().
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*/
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void rfkill_unregister(struct rfkill *rfkill)
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{
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device_del(&rfkill->dev);
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rfkill_remove_switch(rfkill);
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put_device(&rfkill->dev);
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}
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EXPORT_SYMBOL(rfkill_unregister);
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/*
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* Rfkill module initialization/deinitialization.
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*/
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static int __init rfkill_init(void)
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{
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int error;
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int i;
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for (i = 0; i < ARRAY_SIZE(rfkill_states); i++)
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rfkill_states[i] = RFKILL_STATE_ON;
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error = class_register(&rfkill_class);
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if (error) {
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printk(KERN_ERR "rfkill: unable to register rfkill class\n");
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return error;
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}
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return 0;
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}
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static void __exit rfkill_exit(void)
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{
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class_unregister(&rfkill_class);
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}
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module_init(rfkill_init);
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module_exit(rfkill_exit);
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